Fig. 1From: Association between SNP12 in estrogen receptor α gene and hypospadias: a systematic review and meta-analysisFlow chart of literature selection. Six hundred and ninety-seven publications were excluded after screening of titles and abstracts. Four eligible articles were excluded from eight relevant articles included in our full-text selection. The reasons for exclusion were as follow: one study was lack of target data; one study was no relevant outcome and two studies reported on the same or overlapping data. Finally, we identified four eligible articlesBack to article page